Check these rotaries out 15A/21A/13G
12-01-03, 02:54 PM
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Check these rotaries out 15A/21A/13G
13G:
http://cp_www.tripod.com/rotary/pg19.htm
"This engine was produced around 1983/1984 for the 1984 LeMans 727c race car, and was used until about 1989.
The engine was based on the 13B engine of the time, with some special parts:
*Special centre housing with phasing gear
*Eccentric shaft to suit the 3 rotor design
*Different front housing (which has holes for the tension bolts to go through, as the tension bolts screw into the special centre housing).
*The rotor housings were the type with the water seal groove. (But, the external shape of the housings is narrower than the 13B)
*Most other parts, while virtually identical to the 13B, were custom-made for this engine
The eccentric shaft used was a new design not previously tried by Mazda. Previous designs were made from modified 2 rotor eccentric shafts joined together with bolts and keyways, which were not rigid enough for extended periods of reliable operation.
Essentially it was a 2 rotor shaft with a long extension on the front of it that went all the way to the front pulley. Then for the front rotor there is an eccentric shaft "sleeve" which slides over the front extension on the eccentric shaft until the angled section of the main eccentric shaft meets the corresponding section in the "sleeve" (Just like the flywheel does in any Mazda rotary).
The bearing/spacer/bolt down plate used to adjust the backlash (as in any Mazda rotary) performs the task of pushing the extension sleeve onto the tapered section.
The extension sleeve is indexed (so the rotor is in the correct phase with the other rotors) by a small keyway.
NOTE: There was also a 4 rotor engine very similar to this engine called the 13J
It was made a few years later that the 13G - see my 4 rotor engine page for details."
15A/21A/22A:
http://cp_www.tripod.com/rotary/pg21.htm
"15A engine
The 15A was a variant of the 10A/12A/13B family. The trochoidal dimensions were identical to the 10A/12A/13B engines, but the rotors and their housings were thicker (13B rotor housings are 80mm wide, 15A was 90mm wide).
This engine was more practical than the 21A because it used a lot of components that were readily available for the 10A/12A/13B family.
Displacement per chamber was 737cc (vs a 13B's 654cc). It produced 135hp @ 5750 rpm and 196Nm (145 lb-ft) @ 3500 rpm. The engine was developed around March 1973, but was halted around 6 months later due to the oil crisis. There is one complete engine and several parts kept by Mazda (I believe they are at the Mazda Museum in Hiroshima)."
http://cp_www.tripod.com/rotary/pg19.htm
"This engine was produced around 1983/1984 for the 1984 LeMans 727c race car, and was used until about 1989.
The engine was based on the 13B engine of the time, with some special parts:
*Special centre housing with phasing gear
*Eccentric shaft to suit the 3 rotor design
*Different front housing (which has holes for the tension bolts to go through, as the tension bolts screw into the special centre housing).
*The rotor housings were the type with the water seal groove. (But, the external shape of the housings is narrower than the 13B)
*Most other parts, while virtually identical to the 13B, were custom-made for this engine
The eccentric shaft used was a new design not previously tried by Mazda. Previous designs were made from modified 2 rotor eccentric shafts joined together with bolts and keyways, which were not rigid enough for extended periods of reliable operation.
Essentially it was a 2 rotor shaft with a long extension on the front of it that went all the way to the front pulley. Then for the front rotor there is an eccentric shaft "sleeve" which slides over the front extension on the eccentric shaft until the angled section of the main eccentric shaft meets the corresponding section in the "sleeve" (Just like the flywheel does in any Mazda rotary).
The bearing/spacer/bolt down plate used to adjust the backlash (as in any Mazda rotary) performs the task of pushing the extension sleeve onto the tapered section.
The extension sleeve is indexed (so the rotor is in the correct phase with the other rotors) by a small keyway.
NOTE: There was also a 4 rotor engine very similar to this engine called the 13J
It was made a few years later that the 13G - see my 4 rotor engine page for details."
15A/21A/22A:
http://cp_www.tripod.com/rotary/pg21.htm
"15A engine
The 15A was a variant of the 10A/12A/13B family. The trochoidal dimensions were identical to the 10A/12A/13B engines, but the rotors and their housings were thicker (13B rotor housings are 80mm wide, 15A was 90mm wide).
This engine was more practical than the 21A because it used a lot of components that were readily available for the 10A/12A/13B family.
Displacement per chamber was 737cc (vs a 13B's 654cc). It produced 135hp @ 5750 rpm and 196Nm (145 lb-ft) @ 3500 rpm. The engine was developed around March 1973, but was halted around 6 months later due to the oil crisis. There is one complete engine and several parts kept by Mazda (I believe they are at the Mazda Museum in Hiroshima)."
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